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questions to five minutes each, the chair opens it, and the chair recognizes himself for five minutes. the u.s. lost sental near iran, and iranians claimed to spoof the gps signal that was in operation with that. last summer, professor humphries from the university of texas, austin said it is possible to spoof the systems to take control of the unmanned aircraft. the testimony states that military gps signals unlike the nonmilitary gps signals, unlike the military gps signals are not encrypted in transparency and predictability make them easily counterfeited or spoofed. ask what research and development is being conducted to address this concern and are there any research and development gaps that you're aware of? dr. toner, if you could start off, and dr. wagner, if you could fill in any gaps that dr. toner leaves out. >> thank you, mr. chairman. you mentioned the very careful experimentation mentioned by the students in texas, and we're aware of those, and, believe me, the security of the communication and control system is one of the key challenges we've looked at for uas, and i mentioned
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